JS error: [https://<<username>>.cloud.seedboxes.cc/js/content.js : 73] TypeError: d.location is null

I have been receiving the error: JS error: [https:/<>..cloud.seedboxes.cc/js/content.js : 73] TypeError: d.location is null

for the last few weeks each time I add a torrent via rutorrent's web interface.

The torrents still load and operate as expected. Previously a success message was displayed.

I removed my username from the URL.

How do I resolve this?